Welding induction

Similar to vibration welding, induction welding allows the bonding of larger parts (on the size scale of a meter) than most of the fusion bonding techniques. The size scale means that both liquid tanks and pressurized gas reservoirs are welded with this process. This welding technique also accommodates polymer materials that contain fillers. 

Note X, commonly accepted by industry E, recommended by Emabond. 

Butt Joint Strength of Thermoplastics from Induction Welding 

Note Failure stress is based on original material thickness, not inclusive of weld bead thickness that is formed. 

Stokes examined the strength of butt welds in PC, PBT, PP, and PC-PBT joints. The gasket material was the respective lap material for the PC, PBT, and PP joints. For the PC-PBT specimen, the gasket material was PBT. Table 12.5 shows the relative strength of the butt joints. 

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Thermoplastics Mechanical Fasteners Adhesives Spin and Vibration Welding Thermal Welding Ultrasonic Welding Induction Welding Remarks... 

Ultrasonic welding is a frictional process that has been well established for heat welding thermoplastic parts. Like induction welding, it also has been adapted for curing structural adhesives such as epoxy. 

Induction welded long seam pipe (similar to ERW) is normally used for 2 to 4 in. (50 to 100 mm) pipe. Continuous (furnace) butt weld pipe is available in V to 4Vfe in. (20 to 115 mm) pipe however, it is never used in critical applications because of its very low reliability. 

Gruman has developed an automated triangular truss-type beam builder using graphite-reinforced polyether sulfone. This beam can be formed in outerspace at the rate of 1.5m per min. from flat stock which is heated and forced continuously around a die. The sections are Induction welded and may be protected from deterioration by the application of a coating of polyether ether ketone (PEEK).(30)... 

Based on the principle of dielectric loss, induction welding is particularly suitable for high-loss thermoplastics such as PVC. However, by adapting certain measures, PVDF films from 10 to 50 pm can be welded. 

Strong and clean structural, hermetic, and high-pressure seals can be obtained from this process. Important determinants of bond quality in induction welding are the joint design and induction coil design. With automatic equipment, welds can be made in less than 1 s. 

Induction welding has also been used for nylon and polycarbonate parts. Because of the variety of formulations available and their direct effect on heat welding parameters, the reader is referred to the resin manufacturer for starting parameters for use in these welding methods. Both nylon and polycarbonate resins should be predried before induction welding. 

The joining of two melt fronts that meet and solidify in a mold cavity. A bond formed during the assembly operation where the joint line is melted before assembly. See Hot-plate welding, Induction welding, and Ultrasonic sealing. ... 

One of the fastest methods of bonding ABS and acetal thermoplastics is induction welding. This process usually takes 3 to 10 s, but can be done in as little as 1 s. During welding, a constant pressure of at least 100 Ih/in should be applied on the joint to minimize the development of bubbles this pressure should be maintained until the joint has sufficiently cooled. When used, metal inserts should be 0.02 to 0.04 in thick. Joints should be designed to enclose the metal insert completely. Inserts made of carbon steel require less power for heating althougdi other types of metal can be used. The insert should be located... 

See also induction welding dielectric heat sealing/welding vibration welding spin welding. 

Induction welding is especially useful on plastics that have a high melt temperature such as the modem engineering plastics. Thus induction welding is used in many under-the-hood automotive appUcations. It is also frequently used for welding large or irregularly shaped parts. 

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